用户指南和参考

MPointFromShape

MPointFromShape 接受类型为多个点的形状和 Spatial 参考系标识以返回多个点。

语法

db2gse.MPointFromShape(ShapeMultiPoint (1M), srs db2gse.coordref)

返回类型

db2gse.ST_MultiPoint

示例

此代码段填充生物学家的 SPECIES_SITINGS 表。

创建具有三列的 SPECIES_SITINGS 表。species 和 genus 列唯一地标识每行, 而 sitings 多个点则存储物种所在的位置。

CREATE TABLE SPECIES_SITINGS (species  varchar(32),
                              genus varchar(32),
                              sitings  db2gse.ST_MultiPoint);
 
/* Create the SQL insert statement to populate the species, genus and
   sitings. The question marks are parameter markers that indicate the
   name and water values that will be retrieved at runtime. */
strcpy (shp_sql,"insert into SPECIES_SITINGS (species,genus,sitings)
values (?,?, db2gse.MPointFromShape (cast(? as blob(1m)),
db2gse.coordref()..srid(0)))");
 
/* Allocate memory for the SQL statement handle and associate the
   statement handle with the connection handle. */
rc = SQLAllocStmt (handle, &hstmt);
 
/* Prepare the SQL statement for execution. */
rc = SQLPrepare (hstmt, (unsigned char *)shp_sql, SQL_NTS);
 
/* Bind the varchar species value to the first parameter. */
pcbvalue1 = species_len;
rc = SQLBindParameter (hstmt, 1, SQL_PARAM_INPUT, SQL_C_CHAR,
     SQL_CHAR, species_len, 0, species, species_len, &pcbvalue1);
 
/* Bind the varchar genus value to the second parameter. */
pcbvalue2 = genus_len;
rc = SQLBindParameter (hstmt, 2, SQL_PARAM_INPUT, SQL_C_CHAR,
   SQL_CHAR, genus_len, 0, name, genus_len, &pcbvalue2);
 
/* Bind the shape to the third parameter. */
pcbvalue3 = blob_len;
rc = SQLBindParameter (hstmt, 3, SQL_PARAM_INPUT, SQL_C_BINARY,
     SQL_BLOB, sitings_len, 0, sitings_shape, sitings_len, &pcbvalue3);
 
/* Execute the insert statement. */
rc = SQLExecute (hstmt);


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